AAC masonry - innovation for

efficient homes

Irina Odor – Commercial Manager

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With a tradition spanning over more than 40 years, CELCO is among the first companies producing ACC (autoclaved cellular concrete), lime, adhesives and mortars. CELCO is a 100% Romanian company and stands for products manufactured in Romania, these being increasingly appreciated, both in the country and abroad.

CELCO S.A.

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CELCO

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Group DD

The company is part of a large group of companies operating in key areas of the Romanian industry (cumulative 2017 turnover: approximately 45 million Euros).

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CELCO CELCO is involved at national and European level in promoting the ACC as a modern and efficient solution.

MEMBRĂ

European AAC Association

Romanian AAC Manufacturers Organization

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CELCO

In order to be in line with the 2020 strategy, new buildings must be nZeB (near zero energy buildings) = buildings with almost zero energy consumption.

nZEB Buildings

2020 Strategy

How do we build a nZEB building?

• High degree of insulation; • Effective window systems; • High-efficiency sealing and natural / mechanical ventilation with a heat

recovery system to reduce heating / cooling needs.

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CELCO • Buildings are currently responsible for 40% of primary

energy consumption.

• There is an energy saving potential in the EU of 20-50%.

• The building's energy performance refers to the total annual energy needs that includes heating, cooling, hot water, electricity.

Improvement of the efficiency of buildings is much easier to achieve in the design phase rather than refurbishing older buildings.

nZEB Buildings

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CELCO •Norms MC 001/1 "Methodology for calculating the energy performance of buildings" and C107 "Thermotechnical calculation in construction" are obsolete!

Obsolete normatives

Arguments:

• Cellular concrete production technology has gone through major progress in recent years;

• The current versions of these documents present in Appendix A properties of ACC products that are currently no longer found on the market;

• It is necessary to update the values according to the tests performed on the new improved ACC products.

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CELCO

Through PRO BCA, proposals were made to MDRAP (Ministry of Regional Development and Public Administration) to update Appedix A and modify the conversion factor of λ10,dry in λcalculation, according to the following argumentation:

We consider that in the above-mentioned norms it is necessary to specify as the first option the choice and calculation of the individual product values by the design engineer based on the data provided by the manufacturers in the Declaration of Performance.

1)

Obsolete normatives

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CELCO The updated Appendix A (identical in both norms) must contain the full range of densities of the currently used ACC elements and the correct thermal conductivity.

2)

We hereby propose the real values of thermal conductivity in the following table:

Dry density

kg/cbm

λ10,dry (EN 1745)

W/m ͦK PROBCA

graph

λ10,dry

proposal P=50% P=90%

300 0.072 0.085 0.088 0.08

400 0.096 0.11 0.108 0.11

500 0.12 0.13 0.132 0.13

600 0.15 0.16 0.152 0.15

700 0.17 0.18 0.172 0.17

Obsolete normatives

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CELCO Modification of conversion factor of λ10,dry in λcalculation

The C107 / 1 norm and the calculation methodology impose that for λ0≤0,16 W / m ͦ K the applied correction is 60% (i.e. a conversion factor of 1.6), taken from the norms of the 1980s, which we considered incorrect in the case of current autoclaved cellular concrete.

3)

We extract from the literature provided by associations of ACC producers in Belgium and Germany

FeBeCel - Belgia http://www.febecel.be/fr/mantech.php

Obsolete normatives

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CELCO

Bundesverband Porenbeton - Germania http://bv-porenbeton.de/attachments/article/44/Handbuch_Porenbeton_2008.pdf

Thus, it results that the humidity of ACC products decreases over time to a constant humidity, with the final conversion factor being 1.1. The EN 1745 standard indicates the following conversion relationship:

λcalculation = λ10, dry x efu x Ucalculation

The Norm MP 022-02 "Methodology for the evaluation of the thermotechnical performance of building materials and products" indicates the following calculation relation for the conversion of the thermal values:

λ 2 = λ 1 · F T · Fw

We extract from the literature provided by associations of ACC producers in Belgium and Germany

Obsolete normatives

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CELCO

For the values of the thermal conductivity calculations of the ACC masonry we read section 7.2.3. of C107-205 part 3 for the calculation of the equivalent thermal conductivity of the ACC masonry, taking into account the thermal conductivity of the ACC product, the thermal conductivity of the mortar and the area of the quasi-homogeneous layer components measured in the plane of the layer (in elevation).

λech = Σ ( λ j x A j) / Σ A j .

The calculations made with these data are centralized in the following tables, mentioning that an 80% humidity of the environment is not found under normal operating conditions of the building (only in exceptional cases, for short periods of time). The normal conditions we propose to include in the norm for a relative humidity of 50% / max. 65% .

Obsolete normatives

In Annex D of MP 022-02 norm, the moisture content values for AAC are given.

By interpolation we calculate u23 ͦC,65% = 0.036

For mortars: u23 ͦC, 50% = 0.04; u23 ͦC, 80% =0.06, and by interpolation u23 ͦC, 65% =0.05

u23 ͦC, 50% = 0.026 moisture content of the masonry material in air balance at 23 ° C and relative humidity of 50%

u23 ͦC, 80% = 0.045 moisture content of the masonry material in air balance at 23 ° C and relative humidity of 80%.

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CELCO

AAC density

(kg/cbm)

λcalcul (W/m ͦK)

AAC element

λcalcul (W/m ͦK)

mortar

λech (W/m ͦK)

Thin joint AAC

masonry

λech (W/m ͦK)

Normal joint

AAC masonry

23ͦ C

50%

23ͦ C

80%

23ͦ C

50%

23ͦ C

80%

23ͦ C

50%

23ͦ C

80%

23ͦ C

50%

23ͦ C

80%

300 0.09 0.10 0,94 1.03 0.10 0.11 0.13 0.14

400 0.12 0.14 0,94 1.03 0.13 0.15 0.16 0.18

500 0.15 0.16 0,94 1.03 0.16 0.17 0.19 0.20

600 0.17 0.19 0,94 1.03 0.18 0.20 0.21 0.23

700 0.19 0.21 0,94 1.03 0.20 0.22 0.22 0.25

We propose updating the Annex A and modification of conversion factor of λ10,dry in λcalculation, according to the following argumentation:

Obsolete normatives

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CELCO

AAC density

(kg/cbm)

λcalcul (W/m ͦK)

AAC elements

λcalcul (W/m ͦK)

mortar

λech (W/m ͦK)

Thin joint AAC

masonry

λech (W/m ͦK)

Normal joint

AAC masonry

23ͦ C

65%

23ͦ C

65%

23ͦ C

65%

23ͦ C

65%

300 0.09 0,98 0.10 0.13

400 0.13 0,98 0.14 0.17

500 0.15 0,98 0.16 0.19

600 0.18 0,98 0.19 0.22

700 0.20 0,98 0.21 0.24

We propose updating the Annex A and modification of conversion factor of λ10,dry in λcalculation, according to the following argumentation:

Obsolete normatives

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The PRO BCA members have made through experimental laboratories URBAN-INCERC IASI Branch, new experimental determinations of stationary thermal transfer properties on a real scale model for two types of masonry made of AAC elements with a thickness of 35 cm and 37,5 cm.

1)

2)

3)

4)

Obsolete normatives

The average thermal conductivity at 10°C of the dry ACC blocks used to build the physical model was determined

to the value of: λ10 med dry= 0,106W/mK Average apparent dry density, determined on 4

blocks of each type: ρi = 405,18kg/m3

Thermal transfer resistance • total thermal resistance of the wall in 350 mm

ACC blocks RT-350=3,337 m2K/W • total thermal resistance of the wall in 375mm

ACC blocks RT-350=3,458 m2K/W The equivalent thermal conductivity coefficient (λech)

• equivalent thermal conductivity of dry masonry,

in 350mm ACC blocks λech t 350 =0,1049W/mK • equivalent thermal conductivity of dry masonry,

in 375mm ACC blocks λech t 375 =0,1084W/mK

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CELCO

New buildings with monolayer exterior masonry made of CELCO ACC of min. 35 cm are energy efficient because they limit heat loss and do not need extra insulation!

Without a good building insulation, no energy reduction system will have the optimal efficiency!

Obsolete normatives

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CELCO

Some of our customers' fears

which we have managed to effectively contradict, regarding AAC:

– Radioactivity of building materials;

– Fire resistance of building materials

Why choose CELCO AAC?

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Why choose CELCO AAC?

CELCO ACC is a healthy material:

CELCO

The phenomenon of radioactivity is present naturally everywhere, being called natural radioactivity. Thus, radionuclides are found in rocks, air, water, soil and in living organisms, including humans..

Most people spend 80% of the time inside buildings, therefore it is important that natural radioactivity from building materials falls within the permissible limits. * Research results by the Technical University of Iasi, 2015

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With CELCO AAC you get a fire resistant building:

CELCO

CELCO ACC is 100% non-combustible, meets Euroclass A1 requirements for fire reaction, does not burn or loses its compressive strength for at least 4 hours, does not release toxic fumes and prevents the spread of fire.

Why choose CELCO AAC?

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CELCO AAC

Apart Hotel Mamaia ALMAR Constanța Business Center

Hotel Scapino Mamaia Tomis Business

Center Constanța

PROJECTS WITH CELCO AAC

Hotel 2D Neptun

Summerland Mamaia

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CELCO AAC

Nord Residence

Apartments building Lira Residence Constanța

Solid Residence Mamaia

PROJECTS WITH CELCO AAC

Certificates

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CELCO

Occupational Health and Quality Management System Environmental Management System Safety Management System

OHSAS 18001:2007 ISO 9001:2008 ISO 14001:2005

AAC masonry - innovation for

efficient homes

Irina Odor – Commercial Manager